Making ground

[Tony Allgood]

Well, this is tricky without seeing the actual circuit... but here
goes...

Make a false ground use two 22k resistors, put them in series, and tie
the free ends to the + and - of the battery. Now AC couple the input
and output. A 2.2uF cap should do. Connect what was your Ovolt to the
mid point of the resitors, except for the input and output grounds,
take these to the - supply. This may work. It all depends on the
circuit. You may need to repeat the 22k thing at various points on the
circuit, eg. non-inverting inputs of op-amps. If it works, try putting
a 100uF cap across the lower of the two 22k resistors. It should be
even better. 

Tony Allgood.

Cumbria, UK

'I may live in the middle of nowhere, but the views are nice'

----------
> From: [22Hz] Productions <aphex at ksu.edu>
> To: synth-diy at horus.sara.nl
> Subject: Making ground
> Date: 30 August 1997 6:15 AM
> 
> 
> 	Ok.. I've got my simple lil' oscillator working (well, not anymore, 
> but I know I had it at one point, so I'm sure I can build another)
and I 
> got the ringmod thang working... But I have a silly little question.
I 
> am(was) using 2 9v batteries to make +/-9v and ground.. + terminal
from 
> one and - terminal from the other, with the 2 leftover terms as a 
> ground.. This worked great, but.. I'd like to keep the circuit to 1
9v 
> battery, please. Is there any way to do this? Hell, things run off of
9v 
> batteries all the time (stomp boxes, et al), how do they do it?
Thanks 
> for any help.. (Now why won't this *!#^(#$*^ thing work... argh.) 
> 
> 	Jason